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other poeples glasses
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I have 2020 vision, and If i've known people with glasses and i asked them how bad their eye sight was, they said 'if you wear my glasses, you'll see what i see when i haven't got them on.' But wouldn't i see the opposite?
Please tell me if i would see what they see or if its the opposite and explain it to me please.
Please tell me if i would see what they see or if its the opposite and explain it to me please.
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People who are short sighted have a focussing point close to them. They can see near things but cannot focus their own eyes to see things far away so need glasses to see in the distance.
People who are long sighted have a focussing point at some point in the distance but may need glasses to see far away if have a high prescription. This is actually because when they look at something and the light enters their eye it may come to a point behind the retina and they have to work their eyes to bring it back to focus but depending on their age and their degree of long sightedness they may not have enough focussing power to do this.
Think about when you see children who have thick glasses which magnify their eyes. They have a high long sighted prescription but can often see in the distance without their specs as they have a high naturally young focussing power. With age as your own lens inside your eye which changes shape to focus becomes less elastic and you lose your own focussing power.
So if you are 60 years old and are +2.00 (a moderate long sighted correction) you will need glasses to see in the distance as you cannot focus yourself to do the work whilst a 20year old will have perfect distance vision as they can still focus enough themselves.
People who are long sighted have a focussing point at some point in the distance but may need glasses to see far away if have a high prescription. This is actually because when they look at something and the light enters their eye it may come to a point behind the retina and they have to work their eyes to bring it back to focus but depending on their age and their degree of long sightedness they may not have enough focussing power to do this.
Think about when you see children who have thick glasses which magnify their eyes. They have a high long sighted prescription but can often see in the distance without their specs as they have a high naturally young focussing power. With age as your own lens inside your eye which changes shape to focus becomes less elastic and you lose your own focussing power.
So if you are 60 years old and are +2.00 (a moderate long sighted correction) you will need glasses to see in the distance as you cannot focus yourself to do the work whilst a 20year old will have perfect distance vision as they can still focus enough themselves.
aahhhhh. so people with 2020 vision can focus their eyes at any distance, short sighted people can only focus on things near to them and long sighted people can only focus on distant thing.
can you get middle sighted people who can focus on objects say 5-10 metres away but anything nearer or further away they can't?
can you get middle sighted people who can focus on objects say 5-10 metres away but anything nearer or further away they can't?
Sorry you cannot be middle sighted I'm afraid.
If you are short sighted you need a minus lens (e.g. -2.50) which is concave to focus the image on the retina.
If you are long sighted you need a plus lens (e.g. +2.50) which is convex to focus the image on the retina.
In between the two would be no prescription with perfect distance vision.
If you are short sighted you need a minus lens (e.g. -2.50) which is concave to focus the image on the retina.
If you are long sighted you need a plus lens (e.g. +2.50) which is convex to focus the image on the retina.
In between the two would be no prescription with perfect distance vision.
Not really. You are confusing prescriptions with levels of vision.
20/20 is the american term for a good level of vision. The uk usually uses 6/6.
A person with a prescription of 0.00 who is neither long or short sighted may have 6/6 vision. A person who is -1.00 (a small short sighted correction) is likely to see 6/12 (a larger target at 6 metres) unaided but with correction see 6/6.
A young person who is +1.00 would be 6/6 with and without specs as they have enough accommodation to see clearly without specs. An older person such as a 70 year old may be 6/12 uncorrected but 6/6 corrected.
20/20 is the american term for a good level of vision. The uk usually uses 6/6.
A person with a prescription of 0.00 who is neither long or short sighted may have 6/6 vision. A person who is -1.00 (a small short sighted correction) is likely to see 6/12 (a larger target at 6 metres) unaided but with correction see 6/6.
A young person who is +1.00 would be 6/6 with and without specs as they have enough accommodation to see clearly without specs. An older person such as a 70 year old may be 6/12 uncorrected but 6/6 corrected.
Factor30
When you have an eye exam your distance vision is measured for about six metres or the result is translated to this distance. This is the 6 part of 6/?. The ? Part is the size of the target.
If you are -11 in your contact lenses your spec prescription is most likely to be -12 or there abouts so your own natural focussing point is about 8cm away from your eyes. Anything further than this distance is blurry unless you screw your eyes up.
Your likely unaided vision would be 6/side of a house.
To be honest, in my opinion anyway, when you are short sighted by over -3.00 (where your own focussing point is 33cm from your eyes) it makes little difference. I am -7.00 myself. The difference in our unaided vision is negligable.
When you have an eye exam your distance vision is measured for about six metres or the result is translated to this distance. This is the 6 part of 6/?. The ? Part is the size of the target.
If you are -11 in your contact lenses your spec prescription is most likely to be -12 or there abouts so your own natural focussing point is about 8cm away from your eyes. Anything further than this distance is blurry unless you screw your eyes up.
Your likely unaided vision would be 6/side of a house.
To be honest, in my opinion anyway, when you are short sighted by over -3.00 (where your own focussing point is 33cm from your eyes) it makes little difference. I am -7.00 myself. The difference in our unaided vision is negligable.
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